2007-03-18 05:09:52 · 5 answers · asked by Dave 4 in Science & Mathematics ➔ Mathematics
a rectangle with sides a and b has a perimeter of 2a+2b
your triangle has a perimeter of:
2(3x-4)+2(7x+10)=6x-8+14x+20=20x+12
2007-03-18 05:13:39 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Let length be a and breadth b,
The formula for perimeter is the sum of all the sides
= a + b + a + b
= 2(a + b)
In this case, a = 7x + 10
b = 3x - 4
Perimeter:
2(7x + 10 + 3x - 4)
= 2(10x + 6)
= 20x + 12
The perimeter is 20x + 12 units
2007-03-18 05:20:23 · answer #2 · answered by Akilesh - Internet Undertaker 7 · 0⤊ 0⤋
Perimeter formula
P = 2L + 2W
p = 2(7x + 10) + 2(3x - 4)
P = 14x + 20 + 6x - 8
P = 20x + 12
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2007-03-18 05:19:13 · answer #3 · answered by SAMUEL D 7 · 0⤊ 0⤋
Double both expressions
Add
Get 20x + 12
2007-03-18 05:17:03 · answer #4 · answered by ? 5 · 0⤊ 0⤋
20x+12=perimeter
because..3x-4+3x-4+7x+10+7x+10=20x+12
2007-03-18 05:17:58 · answer #5 · answered by ? 4 · 0⤊ 0⤋